Number of n X n 0..1 arrays with every element unequal to 0, 1 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
A299589
Number of n X n 0..1 arrays with every element unequal to 0, 1 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =23a(4) =113a(5) =576a(6) =2583a(7) =11656a(8) =54738a(9) =252959a(10) =1159927a(11) =5359097a(12) =24760544a(13) =114126327a(14) =526426848a(15) =2429504050a(16) =11207820807a(17) =51702119063a(18) =238537489057
External references
- oeis: A299589